The Western Breach offers one of the shortest climbing routes to the summit. The core of this route, stretching from Arrow Glacier Camp to Crater Camp, involves several short non-exposed simple scrambling sections (grade I on the UIAA scale, or equivalently YDS class 2). It was temporarily closed after a rock slide accident in January 2006 killed three people. 
Despite its moderate inherent risks, among experienced climbers the Western Breach is still a popular ascent route because it is very direct and more interesting than the two heavily frequented standard routes on the southeast face of Kibo.  
Alternatively, it is possible for trekkers on most other routes to stay one night in the crater at the Crater Camp, allowing for extended time to explore the peak without the added risk of an assault via the Western Breach.